• =?UTF-8?B?IsOYaXZpbmQi?= (26/26) Aug 13 2012 When building my program by compiling .o files first and then
• Adam D. Ruppe (31/31) Aug 16 2012 You're not doing anything wrong, this is an old bug that shows up

=?UTF-8?B?IsOYaXZpbmQi?= <oivind.loe gmail.com> writes:

When building my program by compiling .o files first and then 
linking, everything links fine, but when I try to compile all the 
source files at once, I get the following link error:

build/debug/dboss-debug.o: In function ` property 
boss.proc.proccmd.ProcCmd.Cmd[immutable(char)[]] 
object.AssociativeArray!(immutable(char)[], 
boss.proc.proccmd.ProcCmd.Cmd).AssociativeArray.rehash()':
/usr/include/dmd/druntime/import/object.di:465: undefined 
reference to 
`_D44TypeInfo_HAyaC4boss4proc7proccmd7ProcCmd3Cmd6__initZ'

The AA in question is a static class member declared as follows:

   static immutable Cmd[string] m_cmds;

And Cmd is a class defined in the same class:

   static class Cmd {
     alias string function(ProcCmd c, string[] args) fExec;

     string  m_cmd;   //Invocation name
     string  m_desc;  //Description of command
     fExec   m_exec;  //Function implementing command

     this(string cmd, string desc, fExec exec) {
       m_cmd = cmd;
       m_desc = desc;
       m_exec = exec;
     }
   }

What am I doing wrong? This is working perfectly fine when 
building object files before linking.

"Adam D. Ruppe" <destructionator gmail.com> writes:

You're not doing anything wrong, this is an old bug that shows up 
at random.

I worked around it in my cgi.d by writing a function like this:


// Referencing this gigantic typeid seems to remind the compiler
// to actually put the symbol in the object file. I guess the 
immutable
// assoc array array isn't actually included in druntime
void hackAroundLinkerError() {
       
writeln(typeid(const(immutable(char)[][])[immutable(char)[]]));
       writeln(typeid(immutable(char)[][][immutable(char)[]]));
       writeln(typeid(Cgi.UploadedFile[immutable(char)[]]));
       
writeln(typeid(immutable(Cgi.UploadedFile)[immutable(char)[]]));
       
writeln(typeid(immutable(Cgi.UploadedFile[])[immutable(char)[]]));
       writeln(typeid(immutable(char[])[immutable(char)[]]));
       // this is getting kinda ridiculous btw. Moving assoc arrays
       // to the library is the pain that keeps on coming.

       // eh this broke the build on the work server
       // writeln(typeid(immutable(char)[][immutable(string[])]));
       writeln(typeid(immutable(string[])[immutable(char)[]]));
}



I never call that function, its simple presence is all that's 
needed.

You should be able to do the same. Try dropping this at the 
bottom of your file with the definition:

void hackAroundLinkerError() {
     writeln(typeid(immutable Cmd[string]));
}



Or some similar variant and see if it works.